The FileSystem interface is an abstraction of a virtual
file system. The similarities of its method names with with the methods
of the java.io.File class are intentional.
Implementations of this interface expose a file system-like resource.
File system-like resources include WebDAV-enabled servers, local file systems,
and so forth.

lastModified

Returns the time that the file system entry denoted by this path
was last modified.

Parameters:

path - the path of a file system entry.

Returns:

A long value representing the time the file system entry was
last modified, measured in milliseconds since the epoch
(00:00:00 GMT, January 1, 1970), or 0L if the modification
time can't be determined.